JP3529968B2 - Level meter device for audio equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a level meter device for audio equipment. 2. Description of the Related Art Conventionally, there is an audio device capable of performing analog recording, which has a function of turning on / off a display of a level meter. The reason for turning on / off the display of the level meter is as follows, for example. (1) The level meter is also used as another different display (for example, remaining amount display) meter. (2) It is annoying if the display is always lit, so the display is turned off. (For example, there is not much need to display the level during playback.) (3) For an audio device capable of digital / analog recording, turn off the light during digital recording. In such an audio device, if the level meter is turned off, the display of the level meter remains off even when analog recording is started. Therefore, when adjusting the recording level, the user had to turn on the level meter and then adjust it. It is an object of the present invention to provide a level meter device for audio equipment which can automatically display a recording level during analog recording. [0005] A level meter device for an audio device according to the present invention is an audio device capable of digital / analog recording, and has an on / off function for displaying a level meter. in the case of analog recording when recording operation, and controls switches on the display of the level meter over. In an audio device capable of digital / analog recording and provided with a function to turn on / off the display of a level meter, a case where analog recording is performed during a recording operation and the display of the level meter is off. , automatically switches on the display of the level meter over. Regardless of the display state of the level meter, the level meter is displayed immediately when recording, and the recording level can be adjusted. FIG. 1 is a block diagram of an MD (mini-disc) recording / reproducing apparatus which is an embodiment of a level meter apparatus for audio equipment according to the present invention. In FIG.
1 is RF matrix amplifier, 2 is servo, EFM / AC
IRC encoder / decoder, 3 is an ATRAC encoder / decoder, 4 is a DRAM memory, 5 is a system controller, 6 is a memory, 7 is a key matrix, 8 is a display, and 9 is a digital / analog converter (DA).
C), 10 are analog / digital converters (AD
C) and 15 are optical pickup assemblies. The display 8 is composed of, for example, a liquid crystal display, and performs various displays during recording and reproduction, and also performs level meter display during reproduction or analog recording. [0008] The RF matrix amplifier 1 processes an RF signal and a servo signal used for recording and reproducing of an MD. This R
The F matrix amplifier 1 is an optical pickup assembly 1
5, a focus error signal and a tracking error signal necessary for controlling focus and tracking, and ADIP which is address information of a recordable MD recording area.
Is output to the servo and EFM / ACIRC encoder / decoder 2. Also, an APC for keeping the amount of laser light emitted from the optical pickup assembly 15 constant.
Circuit included. Servo, EFM / ACIRC encoder
The servo controller in the decoder 2 receives the focus error signal and the tracking error signal of the optical pickup from the RF matrix amplifier 1, and extracts the focus servo and the tracking servo of the optical pickup, and further extracts the motor control servo signal and the address information from the ADIP signal. The control of the feed mechanism of the optical pickup assembly 15 and the rotation control of the disk are performed. The analog audio input level is adjusted by VR1 and ADC1
Input to 0. At the time of encoding, the EFM / ACIRC encoder / decoder adds an error correction code to the analog audio input signal 12 or the digital audio input signal 14 digitally converted by the ADC 10 encoded by the ATRAC encoder / decoder 3 using ACIRC. , EFM, and outputs the result to the RF matrix amplifier 1. When decoding, RF
The input of the EFM signal from the matrix amplifier 1 is EFM-demodulated, error-corrected by ACIRC, and output to the ATRAC encoder / decoder 3. This signal is ATRA
The digital audio output 13 is C-decoded and converted into an analog audio output 11 by the digital audio output 13 or the DAC 9. The ATRAC encoder / decoder 3 uses M
Performs audio compression / expansion of the D recording / reproducing device. Here, the audio compression data is compressed to about 1/5 of the original data,
Also, since the rotational speed of the MD is the same as the specified speed of the EFM, the difference between the data input amount and the output amount is about five times or 1/5. Therefore, a DRAM memory called a shock proof memory is used as the data buffer. 4 is used. The system controller 5 includes a microcomputer or the like, and includes the RF matrix amplifier 1, the servo,
An instruction is issued to the FM / ACIRC encoder / decoder 2 to perform normal reproduction, recording, pause, stop, search, on / off of a level meter display, and the like. Further, it receives TOC and UTOC information and address information recorded on the MD from the servo and EFM / ACIRC encoder / decoder 2 and decodes the information and generates time display data. On / off of the display of the level meter may be automatically switched or may be switched by an input from the key matrix 7. The memory 6 is a memory for storing management information necessary for reproduction of a disc such as TOC and UTOC information received via the system controller 5 and display of a track name, and performs reading and writing when necessary. Do. The key matrix 7 receives a user's instruction and controls the system controller 5 to control normal reproduction, recording, pause, stop, search, on / off of display of a level meter, operation of the memory 6, and switching of display on the display 8. And so on. The operation of the above configuration at the time of analog recording of an audio signal will be described with reference to the flowchart shown in FIG. In response to an analog recording command from the key matrix 7, the audio input signal 12 is level-adjusted by VR1 and then digitally converted by the ADC 10, and ATRA
ACIR encoded by C encoder / decoder 3
An error correction code is added by the C encoder 2, EFM-modulated, and the optical pickup assembly 15
(Not shown). At the start of the analog recording, first, in step S1, the system controller 5 checks whether recording is possible. If the answer to S1 is yes, the process proceeds to S2, and the system controller 5 checks whether or not analog recording is performed. If the answer to S2 is yes, proceed to S3, otherwise proceed to S5. In S3, the system controller 5 checks whether or not the level meter display on the display 8 is off. If yes, proceed to S4, and if no, proceed to S5. In S4, the system controller 5 switches on the level meter, and then starts recording in S5. If the answer to S2 is NO and if the answer to S4 is NO, recording is started in S5. As described above, each state of the device is checked,
Even if the level meter display on the display 8 is instructed to be turned off by the key matrix 7, at the time of analog recording, the level meter display is automatically turned on under the control of the system controller 5 to adjust the recording level. A state in which it can be made by using VR1. As described above, regardless of the display state of the level meter, the level meter is displayed immediately upon recording, and control is performed so that the recording level can be adjusted. Can be omitted. According to the present invention, an easy-to-use level meter device for audio equipment can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a block diagram of an MD (mini-disc) recording / reproducing device which is an embodiment of a level meter device for audio equipment according to the present invention. It is a flowchart explaining a recording operation. [Description of Signs] 1 RF matrix amplifier 2 Servo, EFM / ACIRC encoder / decoder 3 ATRAC encoder / decoder 4 DRAM memory 5 System controller 6 Memory 7 Key matrix 8 Display 9 Digital / analog converter (DAC) 10 Analog / digital converter ( ADC) 15 Optical pickup assembly

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Claims (1)

(57) [Claims 1] In an audio device capable of digital / analog recording, having an on / off function of a level meter display, in the case of analog recording during a recording operation, level meter device of the sound equipment and controlling switches on the display of the level meter over.